Just a bit of fun when upgrading Bullseye to Bookworm is for some reason if you use non-standard ports in Apache it will no longer work. I’ve spent hours troubleshooting and looking at configuration and log files trying to figure out why I couldn’t connect to port 444 which I use to access it internally. I use a reverse proxy to handle the external connections.
To see if the ports are being blocked I did broad port scans and noticed 444 never responded while port 443 did. Soon as I changed the port from 444 to 443 (standard https) in the apache ini file for nextcloud it worked. Oddly enough firewall is not enabled nor installed. Iptables shows nothing is being blocked so makes me wonder did something changed in Apache in terms of security?
Figured I throw this out there if you use non-standard ports.